ERPG-1 ERPG-2 MRL REL 

CHEMICAL NAME CAS NO. HAP NO. mg/m3 mg/m3 mg/m3 mg/m3 

Acetaldehyde 75-07-0 1 81 i 81 i 490 i 200 i 81 490 0.4

Acetamide 60-35-5 2 Acetonitrile 75-05-8 3 22 i 22 i 540 i 140 i 

Acetophenone 98-86-2 4 2-Acetylaminofluorene 53-96-3 5 Acrolein 107-02-8 6 0.069 i 0.069 i 0.23 i 0.23 i 0.069 0.23 0.0069 0.002

Acrylamide 79-06-1 7 Acrylic acid 79-10-7 8 4.4 i 4.4 i 140 i 41 i 4.4 140 

Acrylonitrile 107-13-1 9 10 p 10 p 130 p 19 p 22 77 0.22 

Allyl chloride 107-05-1 10 8.8 i 8.8 i 170 i 69 i 9.4 130 

4-Aminobiphenyl 92-67-1 11 Aniline 62-53-3 12 30 f 3.8 f 46 f 5.7 f 

Anisidine 90-04-0 13 Antimony compounds 7440-36-0 173 Antimony pentafluoride 7783-70-2 173 Antimony potassium tartrate 304-61-0 173 Antimony trihydride 7803-52-3 173 i 7.7 i 0.92 i

Antimony trioxide 1309-64-4 173 Arsenic chloride 7784-34-1 174 Arsenic compounds 7440-38-2 174 0.000

Arsenic oxide 1327-53-3 174 i 3 i 1.2 i

Arsenic pentoxide 1303-28-2 174 0.000Arsine 7784-42-1 174 f 0.54 f 0.064 f 0.54 0.

Asbestos 1332-21-4 14 Benzene 71-43-2 15 170 i 29 i 2600 i 640 i 170 2600 0.029 1

Benzidine 92-87-5 16 Benzotrichloride 98-07-7 17 Benzyl chloride 100-44-7 18 5.2 52 0.Beryllium chloride 7787-47-5 175 Beryllium compounds 7440-41-7 175 0.025 Beryllium fluoride 7787-49-7 175 Beryllium nitrate 13597-99-4 175 Beryllium oxide 1304-56-9 175 Biphenyl 92-52-4 19 i 61 i 28 i

Bis(2-ethylhexyl)phthalate 117-81-7 20 Bis(chloromethyl)ether 542-88-1 21 i 0.21 i 0.094 i 0.47

Bromoform 75-25-2 22 1,3-Butadiene 106-99-0 23 1500 i 1500 i 12000 i 6000 i 1500 12000 

Cadmium compounds 7440-43-9 176 0.00003 

Cadmium oxide 1306-19-0 176 Cadmium stearate 2223-93-0 176 Calcium cyanamide 156-62-7 24 Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010). Revisions since 6/12/07 are shown in red. AEGL = Acute exposure guideline levels for 

moderate effects (AEGL-2) for 1- and 8-hour exposures. Superscripts indicate the AEGL's status: f = final, i=interim, and p=proposed. ERPG = US DOE Emergency Removatransient effects (ERPG-1) and irreversible or serious effects (ERPG-2) for 1-hour exposures. MRL = ATSDR minumum risk levels for no adverse effects for 1 to 14-day exporeference exposure level for no adverse effects. Most, but not all, RELs are for 1-hour exposures. IDLH/10 = One-tenth of levels determined by NIOSH to be imminently danapproximately comparable to mild effects levels for 1-hour exposures. TEEL = US DOE Temporary emergency exposure limits for no effects (TEEL-0) and mild, transient efexposures. TEELs are derived according to a tiered, formula-like methodology, and do not undergo peer review. They are not recommended as the basis for regulatory desonly to inform situations where acute values from other sources are not available.

Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010) AEGL-1 (1-h) AEGL-1 (8-h) AEGL-2 (1-h) AEGL-2 (8-h)

mg/m3 mg/m3 mg/m3 mg/m3
ERPG-1 ERPG-2 MRL REL 

CHEMICAL NAME CAS NO. HAP NO. mg/m3 mg/m3 mg/m3 mg/m3 

Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010). Revisions since 6/12/07 are shown in red. AEGL = Acute exposure guideline levels for moderate effects (AEGL-2) for 1- and 8-hour exposures. Superscripts indicate the AEGL's status: f = final, i=interim, and p=proposed. ERPG = US DOE Emergency Removatransient effects (ERPG-1) and irreversible or serious effects (ERPG-2) for 1-hour exposures. MRL = ATSDR minumum risk levels for no adverse effects for 1 to 14-day exporeference exposure level for no adverse effects. Most, but not all, RELs are for 1-hour exposures. IDLH/10 = One-tenth of levels determined by NIOSH to be imminently danapproximately comparable to mild effects levels for 1-hour exposures. TEEL = US DOE Temporary emergency exposure limits for no effects (TEEL-0) and mild, transient efexposures. TEELs are derived according to a tiered, formula-like methodology, and do not undergo peer review. They are not recommended as the basis for regulatory desonly to inform situations where acute values from other sources are not available.

Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010) AEGL-1 (1-h) AEGL-1 (8-h) AEGL-2 (1-h) AEGL-2 (8-h)

mg/m3 mg/m3 mg/m3 mg/m3

Captan 133-06-2 26 Carbaryl 63-25-2 27 Carbon disulfide 75-15-0 28 40 f 21 f 500 f 160 f 40 500 6

Carbon tetrachloride 56-23-5 29 280 i 120 i 1200 i 510 i 280 1200 1

Carbonyl sulfide 463-58-1 30 i 140 i 57 i

Catechol 120-80-9 31 Chloramben 133-90-4 32 Chlordane 57-74-9 33 Chlorine 7782-50-5 34 1.5 f 1.5 f 5.8 f 2.1 f 1.5 5.8 0.2 0.

Chloroacetic acid 79-11-8 35 f 26 f 3.2 f

2-Chloroacetophenone 532-27-4 36Chlorobenzene 108-90-7 37 46 i 46 i 690 i 690 i 

Chlorobenzilate 510-15-6 38 Chloroform 67-66-3 39 i 310 i 140 i 310 0.49 0.

Chloromethyl methyl ether 107-30-2 40 i 1.6 i 0.73 i 1.6

Chloroprene 126-99-8 41 Chromium (III) compounds 16065-83-1 177Chromium (VI) compounds 18540-29-9 177 Chromium (VI) trioxide, chromic acid mist 11115-74-5 177 Chromium chloride 10025-73-7 177 Chromium compounds 7440-47-3 177 Cobalt bromide 7789-43-7 178 Cobalt carbonate 513-79-1 178 Cobalt carbonyl 10210-68-1 178 Cobalt chloride 7646-79-9 178 Cobalt compounds 7440-48-4 178 Cobalt hydrocarbonyl 16842-03-8 178 0.13 0.13Cobalt nitrate Co Nitrate 178 Cobalt oxides (mixed) COBOXIDES 178 Coke Oven Emissions 8007-45-2 179 m-Cresol 108-39-4 44 o-Cresol 95-48-7 43 p-Cresol 106-44-5 45 Cresols (mixed) 1319-77-3 42 Cumene 98-82-8 46 250 i 250 i 1500 i 640 i Cyanophos 2636-26-2 180 Cyanuric fluoride 675-14-9 180 Cyanide compounds 57-12-5 180 Acetone cyanohydrin 75-86-5 180 7 f 3.5 f 25 f 8.7 f

Barium cyanide 542-62-1 180 Calcium cyanide 592-01-8 180 3.8 p 1.9 p 13 p 4.7 pCopper cyanide 544-92-3 180 
ERPG-1 ERPG-2 MRL REL 

CHEMICAL NAME CAS NO. HAP NO. mg/m3 mg/m3 mg/m3 mg/m3 

Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010). Revisions since 6/12/07 are shown in red. AEGL = Acute exposure guideline levels for moderate effects (AEGL-2) for 1- and 8-hour exposures. Superscripts indicate the AEGL's status: f = final, i=interim, and p=proposed. ERPG = US DOE Emergency Removatransient effects (ERPG-1) and irreversible or serious effects (ERPG-2) for 1-hour exposures. MRL = ATSDR minumum risk levels for no adverse effects for 1 to 14-day exporeference exposure level for no adverse effects. Most, but not all, RELs are for 1-hour exposures. IDLH/10 = One-tenth of levels determined by NIOSH to be imminently danapproximately comparable to mild effects levels for 1-hour exposures. TEEL = US DOE Temporary emergency exposure limits for no effects (TEEL-0) and mild, transient efexposures. TEELs are derived according to a tiered, formula-like methodology, and do not undergo peer review. They are not recommended as the basis for regulatory desonly to inform situations where acute values from other sources are not available.

Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010) AEGL-1 (1-h) AEGL-1 (8-h) AEGL-2 (1-h) AEGL-2 (8-h)

mg/m3 mg/m3 mg/m3 mg/m3

Cyanogen 460-19-5 180 4.3 p 2.1 p 18 p 9.2 pCyanogen bromide 506-68-3 180 Cyanogen chloride 506-77-4 180 1Cyanogen iodide 506-78-5 180 Hydrogen cyanide 74-90-8 180 2.2 f 1.1 f 7.8 f 2.8 f 7.8 0.

Potassium cyanide 151-50-8 180 Potassium silver cyanide 506-61-6 180 Potassium thiocyanate 333-20-0 180 Silver cyanide 506-64-9 180 Sodium cyanide 143-33-9 180 Zinc cyanide 557-21-1 180 2,4-D, salts and esters 94-75-7 47 DDE 72-55-9 48 Diazomethane 334-88-3 49 Dibenzofuran 132-64-9 50 2,3,4,7,8-Pentachlorodibenzofuran 57117-31-4 187 1,2-Dibromo-3-chloropropane 96-12-8 51 Dibutylphthalate 84-74-2 52 p-Dichlorobenzene 106-46-7 53 12 3,3'-Dichlorobenzidine 91-94-1 54 Dichloroethyl ether 111-44-4 55 1,3-Dichloropropene 542-75-6 56 Dichlorvos 62-73-7 57 0.99 p 0.99 p 5.1 p 5.1 p 0.018 

Diesel engine emissions DIESEL EMIS. 999 Diethanolamine 111-42-2 58 Diethyl sulfate 64-67-5 60 N,N-diethyl/dimethylaniline Dialks 593,3'-Dimethoxybenzidine 119-90-4 61 p-Dimethylaminoazobenzene 60-11-7 62 3,3'-Dimethylbenzidine 119-93-7 63 Dimethyl carbamoyl chloride 79-44-7 64 Dimethyl formamide 68-12-2 65 i 270 i 110 i 6 270 

Dimethyl phthalate 131-11-3 67 Dimethyl sulfate 77-78-1 68 0.12 i 0.045 i 0.62 i 0.22 i 

N,N-dimethylaniline 121-69-7 59 1,1-Dimethylhydrazine 57-14-7 66 f 7.4 f 0.93 f 4,6-Dinitro-o-cresol 534-52-1 69 2,4-dinitrophenol 51-28-5 70 2,4-Dinitrotoluene 121-14-2 71 2,4/2,6-Dinitrotoluene (mixture) 25321-14-6 71 1,4-Dioxane 123-91-1 72 61 i 61 i 1200 i 360 i 7.2 

1,2-Diphenylhydrazine 122-66-7 73 
ERPG-1 ERPG-2 MRL REL 

CHEMICAL NAME CAS NO. HAP NO. mg/m3 mg/m3 mg/m3 mg/m3 

Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010). Revisions since 6/12/07 are shown in red. AEGL = Acute exposure guideline levels for moderate effects (AEGL-2) for 1- and 8-hour exposures. Superscripts indicate the AEGL's status: f = final, i=interim, and p=proposed. ERPG = US DOE Emergency Removatransient effects (ERPG-1) and irreversible or serious effects (ERPG-2) for 1-hour exposures. MRL = ATSDR minumum risk levels for no adverse effects for 1 to 14-day exporeference exposure level for no adverse effects. Most, but not all, RELs are for 1-hour exposures. IDLH/10 = One-tenth of levels determined by NIOSH to be imminently danapproximately comparable to mild effects levels for 1-hour exposures. TEEL = US DOE Temporary emergency exposure limits for no effects (TEEL-0) and mild, transient efexposures. TEELs are derived according to a tiered, formula-like methodology, and do not undergo peer review. They are not recommended as the basis for regulatory desonly to inform situations where acute values from other sources are not available.

Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010) AEGL-1 (1-h) AEGL-1 (8-h) AEGL-2 (1-h) AEGL-2 (8-h)

mg/m3 mg/m3 mg/m3 mg/m3

Epichlorohydrin 106-89-8 74 22 i 22 i 91 i 38 i 22 91 1

1,2-Epoxybutane 106-88-7 75 210 p 210 p 410 p 410 p

Ethyl acrylate 140-88-5 76 34 i 34 i 150 i 38 i 34 150 

Ethyl benzene 100-41-4 77 140 p 140 p 4800 p 2500 p 43 

Ethyl carbamate 51-79-6 78 Ethyl chloride 75-00-3 79 40 Ethylene dibromide 106-93-4 80 130 i 35 i 180 i 50 i 

Ethylene dichloride 107-06-2 81 200 810 Ethylene glycol 107-21-1 82 2Ethylene imine (Aziridine) 151-56-4 83 i 8.1 i 0.83 i

Ethylene oxide 75-21-8 84 i 81 i 14 i 81 

Ethylene thiourea 96-45-7 85 Ethylidene dichloride (1,1-Dichloroethane) 75-34-3 86 Formaldehyde 50-00-0 87 1.1 f 1.1 f 17 f 17 f 1.1 17 0.049 0.05

Diethylene glycol monobutyl ether 112-34-5 181 Diethylene glycol monoethyl ether 111-90-0 181 Ethylene glycol ethyl ether 110-80-5 181 0.Ethylene glycol ethyl ether acetate 111-15-9 181 0.Ethylene glycol methyl ether 109-86-4 181 0.0Ethylene glycol methyl ether acetate 110-49-6 181Heptachlor 76-44-8 88 Hexachlorobenzene 118-74-1 89 Hexachlorobutadiene 87-68-3 90 11 32Hexachlorocyclopentadiene 77-47-4 91 Hexachlorodibenzo-p-dioxin, mixture 19408-74-3 187 Hexachloroethane 67-72-1 92 58Hexamethylene-1,6-diisocyanate 822-06-0 93 Hexamethylphosphoramide 680-31-9 94 n-Hexane 110-54-3 95 i 12000 i 12000 i 

Hydrazine 302-01-2 96 0.13 i 0.13 i 17 i 2.1 i 0.13 17 

Hydrochloric acid 7647-01-0 97 2.7 f 2.7 f 33 f 16 f 2.7 33 2

Hydrofluoric acid 7664-39-3 98 0.82 f 0.82 f 20 f 9.8 f 0.82 20 0.016 0.

Hydrogen sulfide 7783-06-4 999 0.71 i 0.46 i 38 i 24 i 0.71 38 0.098 0.0Hydroquinone 123-31-9 99 Isophorone 78-59-1 100 Lead acetate 301-04-2 182 Lead chloride 7758-95-4 182 Lead compounds 7439-92-1 182 Lead nitrate 10099-74-8 182 Lead subacetate 1335-32-6 182 Tetraethyl lead 78-00-2 182 Tetramethyl lead 75-74-1 182 
ERPG-1 ERPG-2 MRL REL 

CHEMICAL NAME CAS NO. HAP NO. mg/m3 mg/m3 mg/m3 mg/m3 

Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010). Revisions since 6/12/07 are shown in red. AEGL = Acute exposure guideline levels for moderate effects (AEGL-2) for 1- and 8-hour exposures. Superscripts indicate the AEGL's status: f = final, i=interim, and p=proposed. ERPG = US DOE Emergency Removatransient effects (ERPG-1) and irreversible or serious effects (ERPG-2) for 1-hour exposures. MRL = ATSDR minumum risk levels for no adverse effects for 1 to 14-day exporeference exposure level for no adverse effects. Most, but not all, RELs are for 1-hour exposures. IDLH/10 = One-tenth of levels determined by NIOSH to be imminently danapproximately comparable to mild effects levels for 1-hour exposures. TEEL = US DOE Temporary emergency exposure limits for no effects (TEEL-0) and mild, transient efexposures. TEELs are derived according to a tiered, formula-like methodology, and do not undergo peer review. They are not recommended as the basis for regulatory desonly to inform situations where acute values from other sources are not available.

Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010) AEGL-1 (1-h) AEGL-1 (8-h) AEGL-2 (1-h) AEGL-2 (8-h)

mg/m3 mg/m3 mg/m3 mg/m3

Lindane (gamma-HCH) 58-89-9 101 alpha-Hexachlorocyclohexane (a-HCH) 319-84-6 101 beta-Hexachlorocyclohexane (b-HCH) 319-85-7 101 technical Hexachlorocyclohexane (HCH) 608-73-1 101 Maleic anhydride 108-31-6 102 0.8 8 Manganese chloride 7773-01-5 183 Manganese compounds 7439-96-5 183 Manganese dioxide 1313-13-9 183 Manganese oxide 1317-35-7 183 Manganese sulfate 7785-87-7 183 Manganese tricarbonyl methylcyclopentadienyl 12108-13-3 183 Mercuric acetate 1600-27-7 184 Mercuric chloride 7487-94-7 184 Mercuric nitrate 10045-94-0 184 Mercuric oxide 21908-53-2 184 Mercury (elemental) 7439-97-6 184 p 1.7 p 0.33 p 2 0.000

Methylmercuric dicyanamide 502-39-6 184 Mercury compounds HG_CMPDS 184 Methoxyethylmercuric acetate 151-38-2 184 Methyl mercury 22967-92-6 184 Phenylmercuric acetate 62-38-4 184 Methanol 67-56-1 103 690 i 350 i 2700 i 680 i 690 2700 

Methoxychlor 72-43-5 104 Methyl bromide 74-83-9 105 i 820 i 260 i 820 0.19 3

Methyl chloride 74-87-3 106 i 1900 i 780 i 1900 1 

Methyl chloroform (1,1,1-Trichloroethane) 71-55-6 107 1300 i 1300 i 3300 i 1700 i 1300 3300 11 

Methyl hydrazine 60-34-4 109 f 3.2 f 0.39 f 

Methyl iodide 74-88-4 110 150 290 Methyl isobutyl ketone 108-10-1 111 Methyl isocyanate 624-83-9 112 f 0.16 f 0.019 f 0.058 0.16 

Methyl methacrylate 80-62-6 113 70 i 70 i 490 i 200 i 

Methyl tert-butyl ether 1634-04-4 114 180 i 180 i 2100 i 1400 i 7.2

4,4'-Methylene bis(2-chloroaniline) 101-14-4 115 Methylene chloride 75-09-2 116 690 i i 1900 i 210 i 690 1900 2.1 

Methylene diphenyl diisocyanate 101-68-8 117 0.2 2 4,4'-Methylenedianiline 101-77-9 118 Naphthalene 91-20-3 119 Nickel acetate 373-02-4 186Nickel carbonyl 13463-39-3 186 f 0.25 f 0.031 f Nickel chloride 7718-54-9 186 Nickel compounds 7440-02-0 186 0.0Nickel nitrate 13138-45-9 186 
ERPG-1 ERPG-2 MRL REL 

CHEMICAL NAME CAS NO. HAP NO. mg/m3 mg/m3 mg/m3 mg/m3 

Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010). Revisions since 6/12/07 are shown in red. AEGL = Acute exposure guideline levels for moderate effects (AEGL-2) for 1- and 8-hour exposures. Superscripts indicate the AEGL's status: f = final, i=interim, and p=proposed. ERPG = US DOE Emergency Removatransient effects (ERPG-1) and irreversible or serious effects (ERPG-2) for 1-hour exposures. MRL = ATSDR minumum risk levels for no adverse effects for 1 to 14-day exporeference exposure level for no adverse effects. Most, but not all, RELs are for 1-hour exposures. IDLH/10 = One-tenth of levels determined by NIOSH to be imminently danapproximately comparable to mild effects levels for 1-hour exposures. TEEL = US DOE Temporary emergency exposure limits for no effects (TEEL-0) and mild, transient efexposures. TEELs are derived according to a tiered, formula-like methodology, and do not undergo peer review. They are not recommended as the basis for regulatory desonly to inform situations where acute values from other sources are not available.

Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010) AEGL-1 (1-h) AEGL-1 (8-h) AEGL-2 (1-h) AEGL-2 (8-h)

mg/m3 mg/m3 mg/m3 mg/m3

Nickel oxide 1313-99-1 186 Nickel refinery dust NI_DUST 186Nickel subsulfide 12035-72-2 186Nickel sulfate 7786-81-4 186 Nitrobenzene 98-95-3 120 4-Nitrobiphenyl 92-93-3 121 4-Nitrophenol 100-02-7 122 2-Nitropropane 79-46-9 123 Nitrosodimethylamine 62-75-9 125 N-Nitrosomorpholine 59-89-2 126 N-Nitroso-N-methylurea 684-93-5 124 Parathion 56-38-2 127 p 1.5 p 0.48 p 

Polychlorinated biphenyls 1336-36-3 136 Aroclor 1016 12674-11-2 136 Aroclor 1221 11104-28-2 136 Aroclor 1242 53469-21-9 136 Aroclor 1248 12672-29-6 136 Aroclor 1254 11097-69-1 136 Aroclor 1260 11096-82-5 136 Pentachloronitrobenzene 82-68-8 128 Pentachlorophenol 87-86-5 129 Phenol 108-95-2 130 58 f 24 f 89 f 46 f 58 89 5

p-Phenylenediamine 106-50-3 131 Phosgene 75-44-5 132 f 1.2 f 0.16 f 1.2 0.0

Phosphine 7803-51-2 133 f 2.8 f 0.35 f 2.8Phosphorus, white 7723-14-0 134 0.02Phthalic anhydride 85-44-9 135 Acenaphthene 83-32-9 187 Anthracene 120-12-7 187 Benzo(a)anthracene 56-55-3 187 Benzo(b)fluoranthene 205-99-2 187 Benzo(k)fluoranthene 207-08-9 187 Benzo(g,h,i)perylene 191-24-2 187 Benzo(a)pyrene 50-32-8 187 Carbazole 86-74-8 187 beta-Chloronaphthalene 91-58-7 187 Chrysene 218-01-9 187 Dibenz(a,h)anthracene 53-70-3 187 Dibenzo[a,e]pyrene 192-65-4 187 Fluoranthene 206-44-0 187 Fluorene 86-73-7 187 Indeno(1,2,3-cd)pyrene 193-39-5 187 
ERPG-1 ERPG-2 MRL REL 

CHEMICAL NAME CAS NO. HAP NO. mg/m3 mg/m3 mg/m3 mg/m3 

Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010). Revisions since 6/12/07 are shown in red. AEGL = Acute exposure guideline levels for moderate effects (AEGL-2) for 1- and 8-hour exposures. Superscripts indicate the AEGL's status: f = final, i=interim, and p=proposed. ERPG = US DOE Emergency Removatransient effects (ERPG-1) and irreversible or serious effects (ERPG-2) for 1-hour exposures. MRL = ATSDR minumum risk levels for no adverse effects for 1 to 14-day exporeference exposure level for no adverse effects. Most, but not all, RELs are for 1-hour exposures. IDLH/10 = One-tenth of levels determined by NIOSH to be imminently danapproximately comparable to mild effects levels for 1-hour exposures. TEEL = US DOE Temporary emergency exposure limits for no effects (TEEL-0) and mild, transient efexposures. TEELs are derived according to a tiered, formula-like methodology, and do not undergo peer review. They are not recommended as the basis for regulatory desonly to inform situations where acute values from other sources are not available.

Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010) AEGL-1 (1-h) AEGL-1 (8-h) AEGL-2 (1-h) AEGL-2 (8-h)

mg/m3 mg/m3 mg/m3 mg/m3

3-Methylcholanthrene 56-49-5 187 1-Methylnaphthalene 90-12-0 187 2-Methylnaphthalene 91-57-6 187 2-Naphthylamine 91-59-8 187 1-Nitropyrene 5522-43-0 187 Phenanthrene 85-01-8 187 Pyrene 129-00-0 187 1,3-Propane sultone 1120-71-4 137 beta-Propiolactone 57-57-8 138 Propionaldehyde 123-38-6 139 110 i 110 i 620 i 260 iPropoxur 114-26-1 140 Propylene dichloride 78-87-5 141 0.23 Propylene oxide 75-56-9 142 170 i 170 i 690 i 200 i 170 690 3

1,2-Propyleneimine 75-55-8 143 i 28 i 2.8 i

Quinoline 91-22-5 144 Quinone 106-51-4 145 Selenium compounds 7782-49-2 189 Hydrogen selenide 7783-07-5 189 i 2.4 i 0.86 i 2.4 0.0

Potassium selenate 7790-59-2 189 Selenious acid 7783-00-8 189 Selenium dioxide 7446-08-4 189 Selenium disulfide 7488-56-4 189 Selenium oxychloride 7791-23-3 189 Selenium sulfide 7446-34-6 189 Sodium selenate 13410-01-0 189 Sodium selenite 10102-18-8 189 Styrene 100-42-5 146 85 i 85 i 550 i 550 i 85 550 8.5 

Styrene oxide 96-09-3 147 2,3,7,8-Tetrachlorodibenzo-p-dioxin 1746-01-6 148 1,1,2,2-Tetrachloroethane 79-34-5 149 Tetrachloroethene 127-18-4 150 240 i 240 i 1600 i 550 i 240 1600 1.4 

Titanium tetrachloride 7550-45-0 151 0.54 i 0.54 i 7.8 i 0.73 i 5.1 7.8

Toluene 108-88-3 152 750 i 750 i 4500 i 2400 i 750 1900 3.8 

2,4-Toluene diamine 95-80-7 153 2,4/2,6-Toluene diisocyanate mixture (TDI) 26471-62-5 154 2,4-Toluene diisocyanate 584-84-9 154 0.14 f 0.071 f 0.59 f 0.15 f 0.14 1.1 

o-Toluidine 95-53-4 155 Toxaphene 8001-35-2 156 1,2,4-Trichlorobenzene 120-82-1 157 1,1,2-Trichloroethane 79-00-5 158 Trichloroethylene 79-01-6 159 700 i 410 i 2400 i 1300 i 700 2400 11

2,4,5-Trichlorophenol 95-95-4 160 
ERPG-1 ERPG-2 MRL REL 

CHEMICAL NAME CAS NO. HAP NO. mg/m3 mg/m3 mg/m3 mg/m3 

Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010). Revisions since 6/12/07 are shown in red. AEGL = Acute exposure guideline levels for moderate effects (AEGL-2) for 1- and 8-hour exposures. Superscripts indicate the AEGL's status: f = final, i=interim, and p=proposed. ERPG = US DOE Emergency Removatransient effects (ERPG-1) and irreversible or serious effects (ERPG-2) for 1-hour exposures. MRL = ATSDR minumum risk levels for no adverse effects for 1 to 14-day exporeference exposure level for no adverse effects. Most, but not all, RELs are for 1-hour exposures. IDLH/10 = One-tenth of levels determined by NIOSH to be imminently danapproximately comparable to mild effects levels for 1-hour exposures. TEEL = US DOE Temporary emergency exposure limits for no effects (TEEL-0) and mild, transient efexposures. TEELs are derived according to a tiered, formula-like methodology, and do not undergo peer review. They are not recommended as the basis for regulatory desonly to inform situations where acute values from other sources are not available.

Table 2. Acute Dose-Response Values for Screening Risk Assessments (4/27/2010) AEGL-1 (1-h) AEGL-1 (8-h) AEGL-2 (1-h) AEGL-2 (8-h)

mg/m3 mg/m3 mg/m3 mg/m3

2,4,6-Trichlorophenol 88-06-2 161 Triethylamine 121-44-8 162 2Trifluralin 1582-09-8 163 2,2,4-trimethylpentane 540-84-1 164 Uranium compounds 7440-61-1 188 Uranium (IV) dioxide 1344-57-6 188 30Uranium hexafluoride 7783-81-5 188 3.6 f f 9.6 f 1.2 f 3.6 9.6

Uranium oxide 1344-59-8 188 10Uranium, soluble salts URANSOLS 188 Uranyl acetate dihydrate 541-09-3 188 Uranyl nitrate hexahydrate 13520-83-7 188 Vinyl acetate 108-05-4 165 24 i 24 i 630 i 260 i 18 260

Vinyl bromide 593-60-2 166 Vinyl chloride 75-01-4 167 640 i 180 i 3100 i 2100 i 640 3100 1.3 1

Vinylidene chloride 75-35-4 168 m-Xylene 108-38-3 171 o-Xylene 95-47-6 170 p-Xylene 106-42-3 172 Xylenes (mixed) 1330-20-7 169 560 i 560 i 4000 i 1700 i 8.7 

Xylenes (mixed) 1330-20-7 169 560 i 560 i 4000 i 1700 i 8.7